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Message-ID: <20211210221813.676660809@linutronix.de>
Date: Fri, 10 Dec 2021 23:18:55 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>,
Alex Williamson <alex.williamson@...hat.com>,
Kevin Tian <kevin.tian@...el.com>,
Jason Gunthorpe <jgg@...dia.com>,
Megha Dey <megha.dey@...el.com>,
Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
Cedric Le Goater <clg@...d.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Juergen Gross <jgross@...e.com>,
xen-devel@...ts.xenproject.org, Arnd Bergmann <arnd@...db.de>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org, Bjorn Helgaas <bhelgaas@...gle.com>,
Stuart Yoder <stuyoder@...il.com>,
Laurentiu Tudor <laurentiu.tudor@....com>,
Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
Santosh Shilimkar <ssantosh@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
Mark Rutland <mark.rutland@....com>,
Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Joerg Roedel <joro@...tes.org>,
iommu@...ts.linux-foundation.org,
Jassi Brar <jassisinghbrar@...il.com>,
Peter Ujfalusi <peter.ujfalusi@...il.com>,
Sinan Kaya <okaya@...nel.org>
Subject: [patch V3 08/35] device: Add device:: Msi_data pointer and struct
msi_device_data
From: Thomas Gleixner <tglx@...utronix.de>
Create struct msi_device_data and add a pointer of that type to struct
dev_msi_info, which is part of struct device. Provide an allocator function
which can be invoked from the MSI interrupt allocation code pathes.
Add a properties field to the data structure as a first member so the
allocation size is not zero bytes. The field will be uses later on.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
---
include/linux/device.h | 5 +++++
include/linux/msi.h | 18 ++++++++++++++++++
kernel/irq/msi.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 55 insertions(+)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -45,6 +45,7 @@ struct iommu_ops;
struct iommu_group;
struct dev_pin_info;
struct dev_iommu;
+struct msi_device_data;
/**
* struct subsys_interface - interfaces to device functions
@@ -374,11 +375,15 @@ struct dev_links_info {
/**
* struct dev_msi_info - Device data related to MSI
* @domain: The MSI interrupt domain associated to the device
+ * @data: Pointer to MSI device data
*/
struct dev_msi_info {
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
struct irq_domain *domain;
#endif
+#ifdef CONFIG_GENERIC_MSI_IRQ
+ struct msi_device_data *data;
+#endif
};
/**
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -171,6 +171,16 @@ struct msi_desc {
};
};
+/**
+ * msi_device_data - MSI per device data
+ * @properties: MSI properties which are interesting to drivers
+ */
+struct msi_device_data {
+ unsigned long properties;
+};
+
+int msi_setup_device_data(struct device *dev);
+
/* Helpers to hide struct msi_desc implementation details */
#define msi_desc_to_dev(desc) ((desc)->dev)
#define dev_to_msi_list(dev) (&(dev)->msi_list)
@@ -233,10 +243,16 @@ void pci_msi_mask_irq(struct irq_data *d
void pci_msi_unmask_irq(struct irq_data *data);
#ifdef CONFIG_SYSFS
+int msi_device_populate_sysfs(struct device *dev);
+void msi_device_destroy_sysfs(struct device *dev);
+
const struct attribute_group **msi_populate_sysfs(struct device *dev);
void msi_destroy_sysfs(struct device *dev,
const struct attribute_group **msi_irq_groups);
#else
+static inline int msi_device_populate_sysfs(struct device *dev) { return 0; }
+static inline void msi_device_destroy_sysfs(struct device *dev) { }
+
static inline const struct attribute_group **msi_populate_sysfs(struct device *dev)
{
return NULL;
@@ -384,6 +400,8 @@ enum {
MSI_FLAG_MUST_REACTIVATE = (1 << 5),
/* Is level-triggered capable, using two messages */
MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
+ /* Populate sysfs on alloc() and destroy it on free() */
+ MSI_FLAG_DEV_SYSFS = (1 << 7),
};
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -73,6 +73,38 @@ void get_cached_msi_msg(unsigned int irq
}
EXPORT_SYMBOL_GPL(get_cached_msi_msg);
+static void msi_device_data_release(struct device *dev, void *res)
+{
+ WARN_ON_ONCE(!list_empty(&dev->msi_list));
+ dev->msi.data = NULL;
+}
+
+/**
+ * msi_setup_device_data - Setup MSI device data
+ * @dev: Device for which MSI device data should be set up
+ *
+ * Return: 0 on success, appropriate error code otherwise
+ *
+ * This can be called more than once for @dev. If the MSI device data is
+ * already allocated the call succeeds. The allocated memory is
+ * automatically released when the device is destroyed.
+ */
+int msi_setup_device_data(struct device *dev)
+{
+ struct msi_device_data *md;
+
+ if (dev->msi.data)
+ return 0;
+
+ md = devres_alloc(msi_device_data_release, sizeof(*md), GFP_KERNEL);
+ if (!md)
+ return -ENOMEM;
+
+ dev->msi.data = md;
+ devres_add(dev, md);
+ return 0;
+}
+
#ifdef CONFIG_SYSFS
static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
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